EUA2046-低EMI无滤波具有自动恢复功能2.8W单声道D类音频放大器  DataSheet
概述
EUA2046 是一款高效率，2.8W单声道D类音频放大器。低噪声无滤波的PWM架构使得EUA2046无需使用外部滤波器直接驱动扬声器，从而减少了外围元件，简化了系统设计。
在工作电压为5V时，输出负载为4Ω的扬声器上，EUA2046可持续输出2.8W并具有10%的THD+N及2.2W并具有1%的THD+N。与传统的AB类放大器相比，EUA2046具有更高的效率。在工作电压为3.6V时，驱动8Ω扬声器输出400mW效率可达84%。
EUA2046可用于移动电话，耳机，对讲电话和门铃。EUA2046具有外部可调整的增益，可调节各输入信号的增益，并将各输入信号进行叠加放大。
特点
●独特的调制方式减少EMI干扰
●短路自动恢复
●工作电压3.6V，负载8Ω，输出功率400mW效率可达84%
●低静态电流和关断电流
●工作电压2.5V-5.5V
●Shutdown 引脚兼容1.8V 逻辑GPIO
●PWM输出级无需滤波器
●-68dB PSRR 无需电源稳压器
●全差分设计无需RF整形器和旁路电容
●改进的CMRR无需使用输入端耦合电容
●内部固定250K开关频率
●内部集成抑制pop和click噪声电路
●8-pin SOP封装
●符合RoHS规范及Pb-Free
应用
●无线移动电话和PDA
EUA2046-Low EMI,2.8-W Mono Filterless Class-D Audio Power Amplifier with Auto-Recovery
Description
The EUA2046 is a high efficiency, 2.8W mono class-D audio power amplifier. A low noise, filterless PWM architecture eliminates the output filter, reducing external component count, system cost, and simplifying design.
Operating in a single 5V supply, EUA2046 is capable of driving 4Ω speaker load at a continuous average output of 2.8W/10% THD+N or 2.2W/1% THD+N. The EUA2046 has high efficiency with speaker load compared to a typical class AB amplifier. With a 3.6V supply driving an 8Ω speaker , the efficiency for a 400mW power level is 84%.
In cellular handsets, the earpiece, speaker phone, and melody ringer can each be driven by the EUA2046. The gain of EUA2046 is externally configurable which allows independent gain control from multiple sources by summing signals from separate sources.
Feature
●Unique Modulation Scheme Reduces EMI Emissions
●Short Circuit Auto-Recovery
●Efficiency at 3.6V With an 8-Ω Speaker:
− 84% at 400 mW
●Low Quiescent Current and Shutdown Current
●2.5V to 5.5V Wide Supply Voltage
●Shutdown Pin Compatible with 1.8V Logic GPIO
●Optimized PWM Output Stage Eliminates LC Output Filter
●Improved PSRR (−68 dB) Eliminates Need for a Voltage Regulator
●Fully Differential Design Reduces RF Rectification and Eliminates Bypass Capacitor
●Improved CMRR Eliminates Two Input Coupling Capacitors
●Internally Generated 250-kHz Switching Frequency
●Integrated Pop and Click Suppression Circuitry
●Available in SOP-8 Package
●RoHS compliant and 100% Lead(Pb)-Free Halogen-Free
Application
●Ideal for Wireless or cellular Handsets and PDAs
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